rds: tcp: compute m_ack_seq as offset from ->write_seq

rds-tcp uses m_ack_seq to track the tcp ack# that indicates
that the peer has received a rds_message. The m_ack_seq is
used in rds_tcp_is_acked() to figure out when it is safe to
drop the rds_message from the RDS retransmit queue.

The m_ack_seq must be calculated as an offset from the right
edge of the in-flight tcp buffer, i.e., it should be based on
the ->write_seq, not the ->snd_nxt.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 6b7ee71..ab7356e 100644 (file)
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -90,9 +90,10 @@ void rds_tcp_nonagle(struct socket *sock)
                              sizeof(val));
 }
 
-u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
+u32 rds_tcp_write_seq(struct rds_tcp_connection *tc)
 {
-       return tcp_sk(tc->t_sock->sk)->snd_nxt;
+       /* seq# of the last byte of data in tcp send buffer */
+       return tcp_sk(tc->t_sock->sk)->write_seq;
 }
 
 u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)

diff --git a/net/rds/tcp.h b/net/rds/tcp.h
index 1aafbf7..864ca7d 100644 (file)
--- a/net/rds/tcp.h
+++ b/net/rds/tcp.h
@@ -54,7 +54,7 @@ void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp);
 void rds_tcp_reset_callbacks(struct socket *sock, struct rds_conn_path *cp);
 void rds_tcp_restore_callbacks(struct socket *sock,
                               struct rds_tcp_connection *tc);
-u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc);
+u32 rds_tcp_write_seq(struct rds_tcp_connection *tc);
 u32 rds_tcp_snd_una(struct rds_tcp_connection *tc);
 u64 rds_tcp_map_seq(struct rds_tcp_connection *tc, u32 seq);
 extern struct rds_transport rds_tcp_transport;

diff --git a/net/rds/tcp_send.c b/net/rds/tcp_send.c
index dc860d1..9b76e0f 100644 (file)
--- a/net/rds/tcp_send.c
+++ b/net/rds/tcp_send.c
@@ -86,7 +86,7 @@ int rds_tcp_xmit(struct rds_connection *conn, struct rds_message *rm,
                 * m_ack_seq is set to the sequence number of the last byte of
                 * header and data.  see rds_tcp_is_acked().
                 */
-               tc->t_last_sent_nxt = rds_tcp_snd_nxt(tc);
+               tc->t_last_sent_nxt = rds_tcp_write_seq(tc);
                rm->m_ack_seq = tc->t_last_sent_nxt +
                                sizeof(struct rds_header) +
                                be32_to_cpu(rm->m_inc.i_hdr.h_len) - 1;
@@ -98,7 +98,7 @@ int rds_tcp_xmit(struct rds_connection *conn, struct rds_message *rm,
                        rm->m_inc.i_hdr.h_flags |= RDS_FLAG_RETRANSMITTED;
 
                rdsdebug("rm %p tcp nxt %u ack_seq %llu\n",
-                        rm, rds_tcp_snd_nxt(tc),
+                        rm, rds_tcp_write_seq(tc),
                         (unsigned long long)rm->m_ack_seq);
        }